Let say if ampere 100amps what are best cable size
Cable size? Not quite sure we understand your question. Electrical wire is measured by the thickness of the core wire (AWG or American Wire Gauge). This measurement is used in the US and many other countries. The larger the core wire, the bigger the gauge number (12 gauge is smaller than 14 gauge). You can always do a google search to get more understand of what I am referring to.